Amgen Inc., of Thousand Oaks, Calif., reported fourth-quarter total revenues of $6.2 billion, an increase of 7 percent over the fourth quarter in 2017. For the full year, revenues grew 4 percent over 2017 to $23.7 billion. Product sales increased 8 percent for the fourth quarter vs. the same period in 2017, and increased 3 percent for the full year.